Affiliation:
1. Bren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, USA.
Abstract
Water supplies for household use and irrigated agriculture rely on groundwater wells. When wells are drilled into a highly pressurized aquifer, groundwater may flow up the well and onto the land surface without pumping. These flowing artesian wells were common in the early 1900s in the United States before intensive groundwater withdrawals began, but their present-day prevalence remains unknown. Here, we compile and analyze ten thousand well water observations made more than a century ago. We show that flowing artesian conditions characterized ~61% of wells tapping confined aquifers before 1910, but only ~4% of wells tapping confined aquifers today. This pervasive loss of flowing artesian conditions evidences a widespread depressurization of confined aquifers after a century of intensive groundwater use in the United States. We conclude that this depressurization of confined aquifers has profoundly changed groundwater storage and flow, increasing the vulnerability of deep aquifers to pollutants and contributing to land subsidence.
Publisher
American Association for the Advancement of Science (AAAS)
Reference160 articles.
1. Groundwater: from mystery to management
2. W. C. Mendenhall R. B. Dole H. Stabler Ground water in San Joaquin Valley California. USGS Water Supply Paper (no. 398) (1916).
3. A. F. Crider L. C. Johnson Summary of the underground-water resources of Mississippi. USGS Water Supply Paper (no. 159) (1906).
4. H. L. Young D. I. Siegel Hydrogeology of the Cambrian-Ordovician aquifer system in the northern Midwest United States with a section on ground-water quality. USGS Professional Paper (no. 1405-B) (1992).
5. A. G. Fiedler Artesian water in Somervell County Texas. USGS Water Supply Paper (no. 660) (1934).